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An organic nutrient essential to an organism’s metabolism that it cannot synthesise for itself is termed a/an:

  • A.trace element
  • B.micronutrient
  • C.growth factor
  • D.essential nutrient

Answer: C

Correct answer: growth factor

A growth factor is an organic compound - a vitamin, an amino acid, a purine or pyrimidine - that an organism must have but cannot make for itself, so it has to be supplied in the medium. Trace elements and micronutrients are inorganic and needed only in minute amounts.

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